Valve mechanism for internal combustion engines



Aug.2, 1932- J. w. MACKENZlE VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES Filed Jan. 4. 1930 Ill J 1 VVIENTOR y 027% if War/rm 1kv %?55? I cylinder and provided with a fluid chamber cylinder member which'is, in effect, a tappet.

Patented Aug. 2, 1932 I I a j UNITED STATES "PATENT VALVE MECHANISM FOB INTERNAL COMBUSTION ENGINES Application filed Jamar-i4, 1930. semi No. 418,468.

The main object of this invention is to prothis spring acts to urge the plun er and vide a valvemechanism for internal combuscylinder in opposite directions, hol ing the tion engines which is noiseless and self-adplunger yieldingly against the cam. The justingto take up any slack or lost motion valve spring 21 is of greater tension or therein; strength than that of the spring so that Objects pertaining to details and econothe valve is not opened by the-spring20.

mies of m lnvention will definitely appear The chamber within the plunger is in comfrom the escription to follow. The invenmunication'with the chamber wi hin the cyl- A tion is defined in the claim. inder through ports or passages 22 WlllCh A structure which embodies the features of open to the annular passage 23 formed in my invention is clearly illustrated in the acthe annular valve seat 24 on the plunger. eompanying drawing, in which: The annular valve 25 is held yieldingly upon Fig. 1 is a fragmentary view of a single this valve seat 24 by means of the spring 26. valve mechanism of an internal combustion To lubricate the cylinder and its guide engine, parts being shown in dotted lines and the cylinder is preferably provided with'an conventionally for convenience in illustraannular" eirternal lubricant distributing tion. groove 27 with a longitudinal groove 28 at Fig.2is an enlarged fragmentary sectional one side leading from the top of the cylview showing details of my valve mechanism. inder to the groove 27, and a longitudinal Referring to the drawing, 1 represents the groove 29 on the opposite side leading, to the cam shaft of an internal co bustion engine lower end of the cylinder and positioned to and 2 one of the valve actuating cams. 3 rep discharge upon the tappet roller 10. v resents the cylinder, 4 one of 'the valves, '5 In the embodiment illustrated the lubrione of the outer iacket walls of the cylinder cant supplied to the push rod will maintain and 6 the valve lever coacting with the valve a supply in the plunger, although there is 4. The wall 5 of the cylinder is provided little likelihood of thislubricant supplied with an opening 7 in which the tubular guide thereto escaping or working out. In normal 8 is seated. This guide '5 alined with the operation the space between the plunger an cam 2. i v cylinder is filled with a fluid, preferably lu- Reciprocating within the guide is a cylinbricant, as stated, and is confined therein exder 9 carrying aroller 10 coaeting with the. cept as it may gradually ork between the cam. The cylinder is provided with arms 11 walls of the plunger and the cylinder which between which the tappet roller is mounted provides efficient lubrication between these and the guide is slotted at 12 to receive tie parts. The lubricant thus escaping, howroller. The cylinder is closed at its lower ever, is returned to the plunger. end providing a reservoir 13 for a fluid, pref- The fluid between these members constierablv tutes a relatively incompressible medium The plunger 14 is arranged within the causing the piston to be carried up with the rvoir 15. Thenplunger is provided This motion is transmitted to the push rod h a depending ex n ioiffi c n it g and through the parts described to the valve.

:1 stop coacting with the bottom bf the cylin- A th m rotates to carry its lift from l under the cylinder the spring 21 forces the T push r 17 i Connected at i pp piston downwardly and this force is comend to the level 6, its IOWBI end rest ng Wi hmunicated through the fluid to the cylinder,

1n the plunger. The stop 16 is shouldered any further possible movement being taken at 18 to receive the thrust collar 19 against u by the spring 20 which would cause a which the upper end of the spring 20 is seatpartial vacuum within the cylinder, permited. The lower end of the spring seats on ting fluid to flow into the same past the valve,

the bottom of the cylinder chamber so that thus taking up any lost motion and provld- 2 v naeaass ing a complete seating of the engine valve,

and at the same time providing quiet operation.

I have illustrated and described my improvements in a very simple and practical embodiment. Should the device be 0 erated without fluid, or the fluid become so 'dified by cold so that it would not flow freely, or the valve fail to function, the device is still operative owing to the stop between the parts permitting only a very limited relative movement. This, however, is all that is required to secure the desired results.

Having thus described myinvention whatclaim as new and desire to secure lay Letters Patent is: r

In a valve mechanism, the combination with an actuating cam and push rod, of a tubular guide, a cylinder reciprocating in said guide in coacting relation with said cam, said cylinder being closed at its lower end, a plunger within said cylinder coacting with said push rod and having a fluid chamber therein and a depending shouldered stop coacting with the bottom of the cylinder to limit the relative movement of the cylinder and plunger, said plunger: having an annular downwardly facing valve seat with an annular channel. therein and ports connecting said channel to said fluid chamber, an annular valve coacting with said valve seat, a valve seating spring, a thrust collar arranged on said shoulder of said sto limiting the opening movement of .sai valve,

and a spring within-said cylinder seating on said collar and acting to yieldingly urge the cylinder against said cam.

In witness whereof I have hereunto set my hand.

JOSEPH W. MACKENZIE. 

